allow re-running of a test item (as exercised by the

pytest-rerunfailures plugins) by re-initializing and removing
request/funcargs information in runtestprotocol() - which is a slightly
odd place to add funcarg-related functionality but it allows all
pytest_runtest_setup/teardown hooks to properly see a valid
request/funcarg content on test items.

CHANGELOG

@@ -1,6 +1,9 @@
 Changes between 2.3.4 and 2.3.5dev
 -----------------------------------
 
+- allow re-running of test items / helps to fix pytest-reruntests plugin
+  and also should help to keep less fixture/resource references alive
+
 - put captured stdout/stderr into junitxml output even for passing tests
   (thanks Adam Goucher)